What Amit should do now?

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Nikhil and Amit are best friends,they share everything happens in their life.Oneday while they were came back from late night cinema,their car was accident.Nikhil lost his left leg,Amit try his best to fill happiness in Nikhil's life,but he failed.Now Nikhil live Amit's house,he couldn't listen anyone's except Amit.Nikhil didn't want to go home,even he denied his parents.The incident was 18 months ago.Now Amit's parents wants Amit's wedding.But Nikhil don't want this,as he feel his friend didn't take care of him anymore.What Amit should do now?